One qubit modeling the universe

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Discussion Overview

The discussion explores the concept of modeling the universe using a single qubit, focusing on the implications of representing a 4-manifold of space-time within the framework of quantum mechanics. The scope includes theoretical considerations and speculative reasoning about the nature of qubits and their potential applications in modeling complex systems.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant suggests that a qubit, being a 2-dimensional complex vector space isomorphic to a 4-dimensional real vector space, could be used to model the 4-manifold of the universe.
  • Another participant expresses skepticism, noting that there are significant challenges in modeling even a single classical bit within a qubit.
  • A later reply reiterates the initial proposal about using one qubit to model the universe, emphasizing that a qubit state represents a vector in that space rather than the space itself, and suggests it could model a universe with only one classical particle.

Areas of Agreement / Disagreement

Participants appear to have differing views on the feasibility of using a single qubit to model the universe, with some proposing the idea and others questioning its practicality. The discussion remains unresolved regarding the validity of the initial proposal.

Contextual Notes

The discussion highlights limitations in understanding the modeling capabilities of qubits, particularly concerning the assumptions about their representation of space-time and the challenges in practical applications.

R.P.F.
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I just had a weird thought.
One qubit is a 2-d complex vector space which is isomorphic to a 4-d real vector space. Why can't we model the 4-manifold of space-time universe using one qubit?
 
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I think that is because we're still having great difficulty modelling even 1 regular bit in a qubit... :smile:
 
I like Serena said:
I think that is because we're still having great difficulty modelling even 1 regular bit in a qubit... :smile:

:cry:
 
r.p.f. said:
:cry:

lol!
 
One qubit is a 2-d complex vector space which is isomorphic to a 4-d real vector space. Why can't we model the 4-manifold of space-time universe using one qubit?
A qubit state is not the space but a vector of that space. So you can model a universe with only one classical particle with it.
 

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